Generally most patients take selegiline phosphate tablets for a long period of time as prescribed by the doctor without harm, but a few patients may experience adverse reactions such as vomiting and headache. Selegiline phosphate tablets belong to the hypoglycemic drugs, which are used to treat type 2 diabetes mellitus. In general, most patients take selegiline phosphate tablets for a long time under the guidance of the doctor is not harmful to the body, and can effectively control blood sugar. There are a few patients in the process of taking selegiline phosphate tablets will appear vomiting, headache, constipation, muscle pain, back pain, itching, upper respiratory tract infection, pancreatitis and other adverse reactions, the patient needs to inform the doctor in time, the doctor will adjust the dosage of the drug or stop the drug according to the actual situation. Note that patients who are allergic to selegiline are prohibited. To summarize, patients must strictly follow the doctor’s instructions to take selegiline phosphate tablets, do not self-medication, so as not to aggravate the condition, affecting the therapeutic effect.